<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
              title="添加商品信息"
              type="info"
              center
              show-icon
              :closable="false">
            </el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
              <el-step title="基本信息"></el-step>
              <el-step title="商品参数"></el-step>
              <el-step title="商品属性"></el-step>
              <el-step title="商品图片"></el-step>
              <el-step title="商品内容"></el-step>
              <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
             <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
              <el-tab-pane label="基本信息" name="0">
                  <el-form-item label="商品名称" prop="goods_name">
                      <el-input v-model="addForm.goods_name"></el-input>
                  </el-form-item>
                  <el-form-item label="商品价格" prop="goods_price">
                      <el-input v-model="addForm.goods_price" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品重量" prop="goods_weight">
                      <el-input v-model="addForm.goods_weight" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品数量" prop="goods_number">
                      <el-input v-model="addForm.goods_number" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品分类" prop="goods_cat">
                      <el-cascader
                        expand-trigger="hover"
                        v-model="addForm.goods_cat"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange"></el-cascader>
                  </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品参数" name="1">
                  <!-- 渲染表单的Item项-->
                  <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                      <!-- 复选框组 -->
                      <el-checkbox-group v-model="item.attr_vals">
                          <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                      </el-checkbox-group>
                  </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品属性" name="2">
                  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                      <el-input v-model="item.attr_vals"></el-input>
                  </el-form-item>
              </el-tab-pane>
              <el-tab-pane label="商品图片" name="3">
                  <!-- action 表示图片要上传到后台API地址 -->
                  <el-upload
                      :action="uploadURL"
                      :on-preview="handlePreview"
                      :on-remove="handleRemove"
                      list-type="picture"
                      :headers="headersObj"
                      :on-success="handleSuccess">
                      <el-button size="small" type="primary">点击上传</el-button>
                  </el-upload>
              </el-tab-pane>
              <el-tab-pane label="商品内容" name="4">
                  <!-- 富文本编辑器组件 -->
                <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                <!-- 添加商品的按钮 -->
                <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
              </el-tab-pane>
             </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
          title="图片预览"
          :visible.sync="previewVisible"
          width="50%">
          <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data() {
     return {
         activeIndex:'0',
        //  添加商品的表单验证对象
         addForm:{
             goods_name:'',
             goods_price:0,
             goods_weight:0,
             goods_number:0,
            //  商品所属的分类名称
             goods_cat:[],
            //  图片的数组
             pics:[],
            //  商品的详情
            goods_introduce:'',
            attrs:[]
         },
         addFormRules:{
            goods_name:[
                 {required:true,message:'请输入商品名称',trigger:'blur'}
                ],
            goods_price:[
                 {required:true,message:'请输入商品价格',trigger:'blur'}
                ],
            goods_weight:[
                 {required:true,message:'请输入商品重量',trigger:'blur'}
                ],
            goods_number:[
                 {required:true,message:'请输入商品数量',trigger:'blur'}
                ],
            goods_cat:[
                 {required:true,message:'请选择商品分类',trigger:'blur'}
                ],
         },
        //  商品分类列表
         catelist:[],
         cateProps:{
             label:'cat_name',
             value:'cat_id',
             children:'children'
         },
        //  动态参数列表数据
         manyTableData:[],
        //  静态属性列表数据
         onlyTableData:[],
        //  上传图片URL地址
         uploadURL:"http://127.0.0.1:8888/api/upload",
        //  图片上传组件的headers请求对象
         headersObj:{
             Authorization:window.sessionStorage.getItem('token')
         },
         previewPath:'',
         previewVisible:false
     }   
    },
    created(){
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res}= await this.$http.get(`categories`)
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败！')
            }
            // this.$message.success('获取商品分类失败！')
            this.catelist=res.data
            // console.log(this.catelist);
        },
        // 级联选择器选择项变化，会触发修改函数
        handleChange(){
            // console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat.length=[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是：'+oldActiveName);
            // console.log('即将进入的标签页名字是：'+activeName);
            // return false
            if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类！')
                return false
            }
        },
        async tabClicked(){
            // console.log(this.activeIndex);
            // 证明访问的是动态参数面板
            if(this.activeIndex==='1'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'many'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                console.log(res.data);
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals.length===0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData=res.data
            }else if(this.activeIndex==='2'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'only'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data);
                this.onlyTableData=res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file);
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            // 1.获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            // 2.从 pics 数组中，找到这个图片对应的索引值
            const i=this.addForm.pics.findIndex(x=>x.pic===filePath)
            // 3.调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo={pic:response.data.tmp_path}
            // 2.蒋图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                // lodash cloneDeep(obj)
                const form=_.cloneDeep(this.addForm)
                form.goods_cat=form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form);

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const {data:res} =await this.$http.post('goods',form)
                if(res.mets.status!==200){
                    return this.$message.error('商品添加失败!')
                }
                this.$message.success('商品添加成功!')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style scoped>
.el-cascader{
    width: 200px;
}
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>